Pediatric dose assessment in common CT examination towards establishment of related regional DRL in Mazandaran, Iran

Abstract

Background: Computed Tomography (CT) is main contributor of popula on dose from diagnos c X-ray examina ons. Children are more radiosensi ve than adults, thus op miza on of CT examina on in these pa ents is essen al. The purpose of this study was to evaluate dose delivered to pediatric pa ents' undergoing CT examina on of the common examina ons and also establishing local Diagnos c Reference Levels (DRLs). Materials and Methods: Ques onnaires were designed for data collec on at seven public hospitals and informa on about pa ent, protocol and CT system were recorded during 2013 and 2014. Dose measurement was performed in four age groups: 0-1, 1-5, 5-10 and 10-15 years old and two CT dose quan ty including CTDIw and DLP were calculated. Results: Values of 40, 48, 59.5, 59.5 mGy; 16.9, 16.9, 17.14, 17.14 mGy;17,17,17, 17 mGy;17,17, 19.2,19.2 mGy in terms of CTDIw and 448, 538, 758, 758 mGy cm; 129, 129, 154, 167 mGy cm; 184, 225, 306, 315 mGy cm; 289, 408, 595, 670 mGy cm in terms of DLP as regional DRL for brain, sinus, chest, abdomen and pelvic examina ons were obtained respec vely. Conclusion: The varia ons in dose of some examina on were considerable. As the role and usage of CT technology con nues to expand, it is important that all prac oners adapt op mized protocols, especially for pediatrics scanning, following proposed reference levels.

A New Method for Estimating of Patient Effective Dose in Computed Tomography Based on Body Mass Index: Performance of the Method in Abdomen-Pelvic Examination

“…Effective Dose [mSv] = 0.257 BMI -0.637 [1] As shown in Figure 4, the mAeff changes according to BMI that there is a linear relation with increasing BMI. An empirical equation is obtained for effective dose according to BMI and it is as follows: mAeff [mGy.cm] = 4.73 BMI -19.81 [2] As shown in Figure 5, the DLP changes according to BMI that there is a linear relation with increasing BMI. An empirical equation is obtained for effective dose according to BMI and it is as follows: DLP [mGy.cm] = 17.17 BMI -56.36 [3]…”

“…The use of ionizing radiation in medical imaging, including computed tomography (CT) provides valuable diagnostic information that undoubtedly has been beneficial for patients [1]. Studies also show that the CT scan increased by 70% between years 1998 and 2003 [2,3]. The CT Provide high quality images, especially in low-contrast soft tissue, are another advantage.…”

Estimating the cancer risk and mortalities induced by routine digital radiography examinations on patient of different ages in Mazandaran province

“…This information can be beneficial for the patients' radiation safety in the medical imaging process. There are several studies, investigating the patients' effective dose and cancer risk from diagnostic imaging procedures (13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23)(24)(25)(26)(27) . Some of these studies have evaluated and assessed the patient's effective dose alone or with image quality parameters (14-16, 22, 23) , and some others have tried to introduce diagnostic reference levels (DRLs) (24) .…”

Dosimetry of Critical Organs in Maxillofacial Imaging with Cone-beam Computed Tomography

“…Nowadays, the use of X-ray as a reliable diagnostic tool in medical practice is inevitable [1-3]. Maxillofacial disease is one of the most common medical problems in communities which is detectable by the use of X-rays.…”